# 데이터셋에 대한 설명을 출력해보면 다음과 같다. 어떤 종류의 데이터가 있고 데이터의 크기가 얼마인지 알 수 있으므로 이러한 설명을 미리 보는 것이 좋다
print( ds_industry[ 'DESCR'])
결과
10 Industry Portfolios
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This file was created by CMPT_IND_RETS using the 202003 CRSP database. It contains value- and equal-weighted returns for 10 industry portfolios. The portfolios are constructed at the end of June. The annual returns are from January to December. Missing data are indicated by -99.99 or -999. Copyright 2020 Kenneth R. French
0 : Average Value Weighted Returns -- Monthly (497 rows x 10 cols)
1 : Average Equal Weighted Returns -- Monthly (497 rows x 10 cols)
2 : Average Value Weighted Returns -- Annual (42 rows x 10 cols)
3 : Average Equal Weighted Returns -- Annual (42 rows x 10 cols)
4 : Number of Firms in Portfolios (497 rows x 10 cols)
5 : Average Firm Size (497 rows x 10 cols)
6 : Sum of BE / Sum of ME (42 rows x 10 cols)
7 : Value-Weighted Average of BE/ME (42 rows x 10 cols)